Conditioned Variation in Heart Rate During Static Breath-Holds in the Bottlenose Dolphin (Tursiops truncatus)
@article{Fahlman2020ConditionedVI, title={Conditioned Variation in Heart Rate During Static Breath-Holds in the Bottlenose Dolphin (Tursiops truncatus)}, author={Andreas Fahlman and Bruno Cozzi and Mercy Manley and Sandra Jabas and Marek Malik and Ashley M. Blawas and Vincent M. Janik}, journal={Frontiers in Physiology}, year={2020}, volume={11} }
Previous reports suggested the existence of direct somatic motor control over heart rate (fH) responses during diving in some marine mammals, as the result of a cognitive and/or learning process rather than being a reflexive response. This would be beneficial for O2 storage management, but would also allow ventilation-perfusion matching for selective gas exchange, where O2 and CO2 can be exchanged with minimal exchange of N2. Such a mechanism explains how air breathing marine vertebrates avoid…
13 Citations
Respiratory sinus arrhythmia and submersion bradycardia in bottlenose dolphins (<italic>Tursiops truncatus</italic>)
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It is found that dolphins exhibit a pronounced respiratory sinus arrhythmia during surface breathing, resulting in a rapid increase in fH after a breath followed by a gradual decrease over the following 15–20 s to a steady fH that is maintained until the following breath.
Respiratory sinus arrhythmia and submersion bradycardia in bottlenose dolphins (Tursiops truncatus)
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The results demonstrate that the fH patterns observed during submerged breath-holds are similar to those resulting from RSA during an extended IBI, highlighting the importance of RSA in influencing fH variability and emphasize the need to understand its relationship to submersion bradycardia.
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